refactor checkbox to use model input

[marcjulian]

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows our guidelines: https://github.com/goetzrobin/spartan/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [X] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Other... Please describe:

Which package are you modifying?

• [ ] accordion
• [ ] alert
• [ ] alert-dialog
• [ ] aspect-ratio
• [ ] avatar
• [ ] badge
• [ ] button
• [ ] calendar
• [ ] card
• [x] checkbox
• [ ] collapsible
• [ ] combobox
• [ ] command
• [ ] context-menu
• [ ] data-table
• [ ] date-picker
• [ ] dialog
• [ ] dropdown-menu
• [ ] hover-card
• [ ] icon
• [ ] input
• [ ] label
• [ ] menubar
• [ ] navigation-menu
• [ ] pagination
• [ ] popover
• [ ] progress
• [ ] radio-group
• [ ] scroll-area
• [ ] select
• [ ] separator
• [ ] sheet
• [ ] skeleton
• [ ] slider
• [ ] sonner
• [ ] spinner
• [ ] switch
• [ ] table
• [ ] tabs
• [ ] textarea
• [ ] toast
• [ ] toggle
• [ ] tooltip
• [ ] typography

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

• [x] Yes
• [ ] No

disabled without value used to work, now disabled needs a value, because model input does not have transform function.

<brn-checkbox 
- disabled 
+ disabled="true"
  id="checkboxId' 
  name="checkboxName">
</brn-checkbox>

This only applies to brn-checkbox, with hlm-checkbox it still works with just disabled because there we can use an input with transform.

Other information

[marcjulian]

@goetzrobin I changed the disabled input model to input with transform to avoid the breaking change.

[goetzrobin]

@marcjulian I see one merge conflict. Else this looks good to me!

[marcjulian]

@goetzrobin Merge conflicts resolved.